| ● | Other. Other revenue includes investment income and other ancillary revenue earned. Revenue decreased $5.9 million, or 21%, to $21.8 million for the year ended December 31, 2021, due to a decline in ancillary revenue associated with surplus inventory in our BrandLoyalty segment. |
Cost of operations. Cost of operations decreased $14.4 million, or 2%, to $573.2 million for the year ended December 31, 2021 as compared to $587.6 million for the year ended December 31, 2020. The decline in the cost of operations was a result of a decrease in the cost of redemptions of $27.4 million resulting from the decrease in redemption revenue noted above, offset in part by $13.2 million in costs associated with the Separation.
General and administrative. General and administrative expenses increased $5.7 million, or 40%, to $20.0 million for the year ended December 31, 2021, as compared to $14.3 million for the year ended December 31, 2020, due to an increase in payroll and benefits and $4.5 million in certain costs associated with the Separation, of which $4.0 million represented the write-off of an indemnification asset established as part of the Tax Matters Agreement.
Depreciation and other amortization. Depreciation and other amortization increased $6.0 million, or 21%, to $34.9 million for the year ended December 31, 2021, as compared to $29.0 million for the year ended December 31, 2020 due to additional capitalized software assets placed into service for digital investments for the AIR MILES Reward Program segment.
Amortization of purchased intangibles. Amortization of purchased intangibles decreased $47.2 million, or 96%, to $1.7 million for the year ended December 31, 2021, as compared to $49.0 million for the year ended December 31, 2020, due to the fully amortized customer contracts in our BrandLoyalty segment.
Goodwill impairment. As a result of the ongoing impact of the COVID-19 pandemic, in the fourth quarter of 2021, we determined that it was more likely than not that the fair value of the BrandLoyalty reporting unit was below its carrying value, and performed an interim impairment test. Based on the results, we recognized a non-cash, goodwill impairment charge of $50.0 million.
Gain on sale of a business. In January 2020, ADS sold Precima, a provider of retail strategy and customer data applications, resulting in a pre-tax gain of $10.9 million.
Interest expense (income), net. Total interest expense, net increased $6.4 million to $5.5 million for the year ended December 31, 2021 as compared to interest income of $(0.8) million for the year ended December 31, 2020. The increase in interest expense is associated with our $675.0 million in senior secured credit agreement entered in connection with the Separation in November 2021.
Taxes. Provision for income taxes increased $30.9 million, or 145%, to $52.2 million for the year ended December 31, 2021 from $21.3 million for the year ended December 31, 2020. The provision for income taxes for 2021 was negatively impacted by certain transactions associated with the Separation, including Canadian withholding taxes associated with payments to the former parent, non-deductible U.S. expenses and goodwill impairment.
(Income) loss from unconsolidated subsidiaries—related party. The income from unconsolidated subsidiary – related party was $4.1 million for the year ended December 31, 2021 as compared to a loss of $0.2 million for the year ended December 31, 2020. Our investment in our unconsolidated subsidiary, Comenity Canada, L.P., was sold to an affiliate of ADS in August 2021 for $4.1 million and we recognized a gain on sale of unconsolidated subsidiary of $4.1 million.
Year ended December 31, 2020 compared to the year ended December 31, 2019
Refer to Item 2, “Management’s Discussion and Analysis of Financial Condition and Results of Operations,” included in of our registration statement on Form 10, filed with SEC on October 13, 2021, for a discussion of our 2020 results compared to 2019, which discussion is incorporated by reference herein.